Answer:
Heterogeneous
Explanation:
not clear explanation sooory
Chalk is an ionic compound. Which is a property of all ionic compounds that makes chalk particularly useful for writing on a chalkboard? A. a high melting point B. hardness and brittleness C. inability to dissolve in water D. a multicolored appearance
Answer:
hardness and brittleness
Explanation:
mark me brainiest if I got it right
What is the density of a bar of soap with a mass of 715g, and a volume of 866cm3?
Answer:
0.826 g/cm³
Explanation:
density = mass/volume
density = 715 g/866 cm³
density = 0.82564 g/cm³
Rounded to 3 significant figures: 0.826 g/cm³
How do you know when a chemical reaction is happenig or happend explain
Answer:
A chemical reaction is usually accompanied by easily observed physical effects, such as the emission of heat and light, the formation of a precipitate, the evolution of gas, or a color change.
ok so you will know when a chemical equation is happening or happened because there will be some sort of spark/fire or something like that.
A sample of an ideal gas at 1.00 atm and a volume of 1.98 L was placed in a weighted balloon and dropped into the ocean. As the sample descended, the water pressure compressed the balloon and reduced its volume. When the pressure had increased to 55.0 atm, what was the volume of the sample? Assume that the temperature was held constant.
Answer:
Final Volume = 0.036 L
Explanation:
Initial Pressure P1 = 1 atm
Initial Volume V1 = 1.98L
Final Pressure T1 = 55.0 atm
Final Volume V2 = ?
Temperature was held constant
The formulae relating these variables is Charles Law. This law states that the volume of a gas is inversely proportional to the pressure of a gas system provided temperature is held constant. The equations given as;
V1P1 = V2P2
V2 = V1P1 / P2
V2 = 1.98 * 1 / 55
V2 = 0.036 L
An object has a mass of 40.1g and occupies a volume of 7.19mL. The density of this object is
A. Too low to measure
B. 288 g/mL
C. 5.58 g/mL
D. 40.1 g/mL
E. 0.179 g/mL
Answer:
5.58 g/mLExplanation:
The density of a substance can be found by using the formula
[tex]density = \frac{mass}{volume} \\ [/tex]
From the question we have
[tex]density = \frac{40.1}{7.19} \\ = 5.57719 ...[/tex]
We have the final answer as
5.58 g/mLHope this helps you
What happens to the particles in a substance when
heat is removed from a liquid?
Answer:When heat is added to a substance, the molecules and atoms vibrate faster. As atoms vibrate faster, the space between atoms increases. The motion and spacing of the particles determines the state of matter of the substance. ... They contract when they lose their heat.
Explanation:Google
Please answer this so I can proceed.
Answer:
you may proceed now
Answer what?? I don't see anything.
Examples of using chemical equilibrium in our daily life (other that ammonia, homeostasis, and others)
Answer:
There are many examples of chemical equilibrium all around you. One example is a bottle of fizzy cooldrink. In the bottle there is carbon dioxide (CO2) dissolved in the liquid. There is also CO2 gas in the space between the liquid and the cap.
A gas has a volume of 20.0 L at a pressure of 950 mmHg with a temperature of 125.0 o If the conditions are changed to STP, what is the new volume of the gas, in liters?
You wish to make a 0.405 M hydrochloric acid solution from a stock solution of 3.00 M hydrochloric acid. How much concentrated acid must you add to obtain a total volume of 100 mL of the dilute solution?
Answer:
Explanation:
We have to make 100 mL 0f .405M HCl from 3 M solution of HCl .
volume of 3M to be taken required . Let this volume be V litre .
V litre of 3M will contain 3 V moles of HCl .
moles contained by 100 mL of ,405 HCl = .405 x .1 = .0405 moles .
So 3V = .0405
V = .0405 / 3 litre
= .0405 x 1000 / 4 mL
= 10.125 mL
So we have to take 10.125 mL of 3M HCl and add water to them to make its volume 100 mL .
The __________________variable is the one factor you manipulate or change in the experiment
How many moles are in 5.6x1025 molecules of calcium oxide?
Answer:
93.02 molesExplanation:
To find the number of moles in a substance given it's number of entities we use the formula
[tex]n = \frac{N}{L} \\[/tex]
where n is the number of moles
N is the number of entities
L is the Avogadro's constant which is
6.02 × 10²³ entities
From the question we have
[tex]n = \frac{5.6 \times {10}^{25} }{6.02 \times {10}^{23} } \\ = 93.023...[/tex]
We have the final answer as
93.02 molesHope this helps you
Which statement is true?
A. Less reactive substances will not undergo chemical reactions.
B. Reactivity is the rate at which a substance undergoes a chemical reaction.
C. A substance's reactivity is determined by its location in the periodic table.
D. Every element in the periodic table reacts strongly with water.
Answer:
I answer is c I'm sorry if I'm wrong but please mark me brainlest I will mean a lot
Is this ground or excited state?
1s2 2s2 2p6 3s1 3p1
Answer:
Explanation:
Ground : 1s2 2s2 2p6 3s2
Excited 1s2 2s2 2p6 3s1
it is excited
If you have 6.7 moles of O2, how many moles of Fe2O3 will it produce?
13.4 moles Fe2O3
13.4 moles Fe, 2, O, 3,
0.96 moles Fe2O3
0.96 moles Fe, 2, O, 3,
23.45 moles Fe2O3
23.45 moles Fe, 2, O, 3,
1.91 moles Fe2O3
Answer:
3.2
Explanation:
Analyze the following blood splatter pictures to determine the general direction, origin, and impact
Answer:
!!!!!!!!!!!!!!!!!!!!!!
Answer:
Figure 1: This blood spatter came from the right side. The impact was not hard. The blood may have come from a dripping wound though there is some evidence of movement, which may indicate the person with the wound was moving as the blood fell.
Figure 2: The elongated blood spatter shows that blood was traveling at a high velocity. The impact came from the right-hand side, and it was forceful.
Figure 3: This spatter shows circular drops, showing that the blood fell under the effect of gravity with no movement from the wound.
Explanation:
Plato
A botfly lays an egg in the skin of an animal. When the larvae hatches from the egg, it burrows deep into the skin . The animal may become sick from having the larvae under its skin. What type of relationship is being describe, and what roles do each organism play?
Answer:
A botfly that lays an egg in the skin of an animal when the larvae hatches from the egg, it burrows deep into the skin. The animal that may become sick from having the larvae under its skin is called Mutualism.
Explanation:
The animal is the host while the botfly is the parasite. A mutualism in which one mutualistic partner removes parasites, as well as dead or diseased skin from another, in return receiving a steady supply of food is called Pollination. Nearly all pollination services involve a mutualism that has evolved over millions of years. Another example is reproduction.
If you start with 30 moles of O2, how many moles of SiO2 can you make?
Answer:
30moles of SiO₂
Explanation:
Given parameters:
Number of moles of O₂ = 30moles
Unknown:
Number of moles of SiO₂ = ?
Solution:
To solve this problem, we need to write the reaction expression:
Si + O₂ → SiO₂
The reaction is balanced;
1 mole of O₂ will produce 1 mole of SiO₂
30mole of O₂ will produce 30moles of SiO₂
To find the number of electrons in a stable element
A-Add the number of protons to the number of electrons
B-Subtract the number of protons from the atomic mass
C-
Subtract the number of protons from electrons
D-It is the same as the atomic number
Answer:
Answer is C . GOOD LESSONS♡
What is the formal charge of P?
Answer:
The formal charge on P would be 0 for this structure.
Explanation:
oyegen and hydrogen
4 oxegens
Answer:
Oxygen
Explanation:
Addition of Silver Nitrate
1. Based upon the color, in which direction does the equilibrium shift?
Shifts Left.
2. Write an equation showing what happens when AgNO3 is added, and explain why the equilibrium shifts.
Addition of Water
3. Explain the equilibrium shift that occurs when water is added to the original equilibrium reaction.
Cu(H2O)62+(aq) + 4Cl–(aq) D CuCl42–(aq) + 6H2O(l)
blue green
Temperature Changes
4. Write "heat" on either the left or right side of this equation, based upon observations from the addition and removal of heat in steps 3 and 4, respectively, and the corresponding shifts in equilibrium.
____ + Cu(H2O)62+(aq) + 4Cl–(aq) D CuCl42–(aq) + 6H2O(l) + _____
Blue Green
Answer:
See explanation
Explanation:
When AgNO3 is added to the system the equilibrium position shifts towards the left hand side because of the formation of AgCl as a precipitate thereby sequestering the Cl^- from solution.
AgNO3(aq) + Cl^-(aq) ------> AgCl(s) + NO3^-(aq)
[Cu(H2O)6]^2+(aq) + 4Cl^–(aq) ------> [CuCl4]^2–(aq) + 6H2O(l)
The equilibrium of this reaction shifts towards the right as more Cl^– is added making the color of the solution to change from blue to green.
[Cu(H2O)6]^2+(aq) + 4Cl^–(aq) + heat ------> [CuCl4]^2–(aq) + 6H2O(l)
This reaction is endothermic. addition of heat makes the solution to turn green (equilibrium shifts towards the right) while removal of heat makes the solution to turn blue (equilibrium shifts towards the left).
HELLLPPPPP
The FDA Code requires that water supply systems include
a backflow or back-siphonage prevention device
pipage composed only of PVC or other plastic materials
regularly spaced emergency shutoff valves
a method of aerating the water at designated checkpoints
Answer:
its A.Explanation:
edge food and nutrition!!
please help urgent!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
How can you safely turn on and off an electromagnet on and off?
(ASAP) (FOOD SCIENCE) how does the addition of starches provide structure to a food product
Answer: In addition to building texture, starches are used to contribute stability to food products. This often takes the form of holding water. As previously mentioned, gelatinized starch molecules tend to reassociate with one another.
how many molecules are present in 7 moles of h2o
Answer:
9moles of h20 hndi parin ako sure
Look at the balanced equation below:
C2H6O + 3 O2 → 2 CO2 + 3 H2O
If you produced 11.5 moles of H2O, how many moles of O2 were used?
11.5 moles O2
11.5 moles O, 2
34.5 moles O2
34.5 moles O, 2
3.83 moles O2
3.83 moles O, 2
7.67 moles O2
Answer:
11.5moles of oxygen gas
Explanation:
The reaction equation is shown below;
C₂H₆O + 3O₂ → 2CO₂ + 3H₂O
We were given 11.5moles of H₂O produced;
Since the equation is balanced;
3 mole of oxygen gas was used to produce 3 mole of water
11.5 moles of water will be produced [tex]\frac{11.5 x 3}{3}[/tex] = 11.5moles of oxygen gas
Which of the following would be an example of a compound? *
5 poir
oxygen
carbon dioxide
sand
O carbon
Answer:
carbon dioxide
Explanation:
An example of a compound from the given choices is carbon dioxide.
A compound is any substance composed of two or more atoms /elements joined together in a definite grouping .
The properties of a compound are different and distinct from the elements that makes them. From the choices, carbon dioxide is made up of two elements which are carbon and oxygen. oxygen and carbon are elements.Sand is a mixture.What is the [H 30 +) in a solution with [OH = 1x10-12 M?
Answer: The way to get the answer is to know and understand certain relationships between [H3O+] and [OH-]. One such relationship which you must know (memorize) is...
[H3O+] [OH-] = 1x10-14 = Kw (the rest is algebra)
[H3O+] [1x10-12] = 1x10-14
[H3O+] = 1x10-14 / 1x10-12
[H3O+] = 1x10-2 = 0.01 M
Explanation: HOPE IT HELPS!
The atmosphere that existed on early Earth was toxic, had no traces of oxygen and the was high levels of ultraviolet radiation from the Sun.
1.True
2.False
An aqueous solution of Iron(III) sulfate, Fe2(SO4)3, is mixed with an aqueous solution of Sodium hydroxide, NaOH. Write:_______. a. balanced molecular equation b. the total ionic equation c. the net ionic equation showing all phases.
Answer:
a.
[tex]Fe_2(SO_4)_3(aq)+6NaOH(aq)\rightarrow 2Fe(OH)_3(s)+3Na_2SO_4(aq)[/tex]
b.
[tex]2Fe^{2+}(aq)+3(SO_4)^{2-}(aq)+6Na^+(aq)+6OH^-(aq)\rightarrow 2Fe(OH)_3(s)+6Na^+(aq)+3(SO_4)^{2-}(aq)[/tex]
c.
[tex]Fe^{2+}(aq)+3OH^-(aq)\rightarrow Fe(OH)_3(s)[/tex]
Explanation:
Hello!
In this case, since the reaction between sodium hydroxide and iron (III) sulfate yields iron (III) hydroxide, an insoluble base, and sodium sulfate, a soluble salt, we can write the molecular equation as shown below:
a.
[tex]Fe_2(SO_4)_3(aq)+6NaOH(aq)\rightarrow 2Fe(OH)_3(s)+3Na_2SO_4(aq)[/tex]
Now, for the total ionic equation, we make sure we separate the aqueous species in ions (dissociation) in order to write:
b.
[tex]2Fe^{2+}(aq)+3(SO_4)^{2-}(aq)+6Na^+(aq)+6OH^-(aq)\rightarrow 2Fe(OH)_3(s)+6Na^+(aq)+3(SO_4)^{2-}(aq)[/tex]
Finally, the net ionic equation comes up by cancelling out the spectator ions, those at both reactants and products sides:
[tex]2Fe^{2+}(aq)+6OH^-(aq)\rightarrow 2Fe(OH)_3(s)[/tex]
Or just:
c.
[tex]Fe^{2+}(aq)+3OH^-(aq)\rightarrow Fe(OH)_3(s)[/tex]
Best regards!
